I have owned my 880 for over a year but I have barely used it until now because I hate manuals, found the machine frustrating and unintuitive, and the YouTube tutorials people put up were well intentioned but hard to gain a good grounding from.
This course was fantastic. I watched it all the way through, then had to do so again, then practiced while using the course as a reference guide.
The result was that at some point it all just clicked and I've got it. I now look at the machine as a friend and have already started making a pretty convincing and complex backing track for a song.
I've also got the zoom r24 course and the boss br800. I've done both of them too and they're fantastic